Well you have a server and cli versions so I'm guessing it's different, and artisan would be called from cli.
If you run on cli
php -i|grep PDO
PDO support => enabled
PDO drivers => mysql, pgsql, sqlite
PDO Driver for MySQL => enabled
PDO Driver for PostgreSQL => enabled
PDO Driver for SQLite 3.x => enabled
and through phpinfo() something similar to:
PDO support enabled
PDO drivers mysql, pgsql, sqlite
PDO Driver for MySQL enabled
Client API version mysqlnd 5.0.11-dev - 20120503 - $Id: f373ea5dd5538761406a8022a4b8a374418b240e $
Directive Local Value Master Value
pdo_mysql.default_socket /var/run/mysqld/mysqld.sock /var/run/mysqld/mysqld.sock
PDO Driver for PostgreSQL enabled
PostgreSQL(libpq) Version 9.3.5
Module version 1.0.2
Revision $Id: fe003f8ab9041c47e97784d215c2488c4bda724d $
PDO Driver for SQLite 3.x enabled
SQLite Library 3.8.2